Filter



(No Model.)

J. TOLAND.

FILTER.

Patented Nov. 1,1881.

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UNITED STATES PATENT Pricey JOHN TOLAND, OF BOSTON, MASSACHUSETTS.

FILTER.

SPECIFICATION forming part of Letters Patent No. 248,697, dated November1, 1881.

Application filed September 1, 1881. (No model.)

To all whom it may concern Be it known that I, JOHN TOLAND, of Boston,of the county of Sufl'olk and State of Massachusetts, have invented ancwand useful Improvementin Filters; and Ido hereby declare the same tobe described in the following specification, and represented in theaccompanying drawings, of which- Figure 1 is a longitudinal, and Fig. 2atransverse, section of a filter embodying my invention, the nature ofwhich is defined in the claims hereinafter set forth.

In such drawings. A is a filtering .drum or cylinder, formed withinternal flanges, a a, arranged in it as shown. Within each end of thesaid drum'is screwed a perforated head, B, against a foraminous orwoven-wire disk, I), resting against the flange (1. Furthermore, at itsmiddle and extending around the drum A is a projecting flange, 0, havinga male screwthread cut on its periphery, to engage with a.circumscribing flange, cl, provided with a corresponding femalescrew-thread, and projecting from the inner surface of acylindricalcase, O. The drum A is arranged concentrically within the case O, therebeing a space, 6, between the two, and against each end, as well asabout the periphery of the drum A. The drum 0, however, has a flange orannular partition,f, arranged in it for the flange c to abut against.One of the heads 9 g of the case O I adapt to the body of the case, soas to be removable therefrom, in order to enable the filtering-drum tobe inserted in or removed from the case. The said removable head ismarked 9, and screws into the case. Furthermore, there are jointed tothe case 0 the bodies h of two three-way cocks, D D, each of such bodiescommunicating with the space 0 by two ports,

ik, arranged with the partition f in manner as shown in Fig. 1. Thehollow plug lof each cock has two educts, m and or, arranged in it inmanner as represented, and there is to each of the cooks a tubularprojection, E, havinga female screw-thread cut in it, as shown at 0,such being to enable the filter to be coupled to pipes of conveyance anddischarge of the fluid to be filtered. On turning the plugs so as tobring their educts m to open into the two ports 70, water passing underpressure into the upper cock will flow therefrom through the upper portit; thence into the spacce to theleft of the partition f; thencelengthwise through the filtering-drum A, duly charged with charcoal orother suitable filtering material; thence into the. spacee to the rightof the said partition thence through the lower portJc and into the lowerplug I, from whence it will escape by the p ssage n and port 1), eachthree-way cock having such a portp arranged in it, as shown in Fig. 1.By revolving each plngso as to put its port a in communication with theport iof the cook the port m will open into the port 19, whereby thecourse of the water orfluid through the filtering-drum will be reversed.So, in putting in communication the ports in and 7c of the upper cockand the ports n and 'i of the lower cock the water or fluid will flowfreely through the case 0 without goingthrough the filtering-drum A.

From the above it will be seen that with the described filter we havemeans of causing water to flow in either of two directions through thedrum A, or to pass through the filter without going through such drum.Thus we can, as occasion may require, cleanse the filter of any depositsleft therein by the water or fluid.

In the place of the three-way cocks, I contemplate sometimes employingmechanical equivalents-such as valves, for instancethough I consider thecooks as preferable thereto.

What I claim as my invention is as follows:

1. The combination, with the case 0, provided with the internal screwflange, d, and the flange or partition f, and with the two three-waycocks D D, adapted to such case, as described, of the internal filteringdrum, A, having the screw-flange 0, and arranged within the case O,substantially in manner as set forth, all being to operate as explained.

2. The combination of the tubular couplingprojections E E, applied tothe three way cocks, with such cocks and with the case 0, provided withthe flanges cl and f, and filtering-drum A, having flange a,constructed, arranged, and adapted substantiallyas explained.

JOHN TOLAND.

Witnesses:

R. H. EDDY, E. B. PRATT.

